Variations on Commodore monitors

As part of the process of getting a second C128 system set up and running, I recently ordered another Commodore 1084 monitor from an eBay seller. The one I have is nice and bright and lets me switch quickly between the composite (40-column) and RGBI (80-column) outputs of the 128, so I was happy to stumble across another one for a reasonable price. It arrived last night, and it's a great little monitor, in even better shape than the one I already had. To my surprise, though, it's also completely different. The case is different, the form factor and positioning of the controls are different -- and, most relevantly, even the connectors are different. My older one (made in 1989) has a DB-9 input for RGBI input. The new arrival (made in 1988, if I recall correctly) has an 8-pin DIN input for RGBI input. Thankfully, I already had a DB-9 to DIN-8 cable in the Big Box of CBM Scraps, so I didn't have to order any cable-making parts from Mouser, but it does bring up a question: how many potentially problematic variations on the same model number did Commodore make? I know that they did a lot of this sort of thing, given the ever-changing appearance of the C2N and 1541, but is there a quick and easy question I can ask a seller to find out exactly what ports to expect on the back of a 1084 (or similar monitor)? "DB-9" and "8-pin DIN" are already way too difficult to explain to somebody just trying to clean out their attack, but if there's a guide out there with a breakdown by manufacturing date or serial number for some of this Commodore equipment, that would be lovely...